Last October, the Financial Crimes Enforcement Network (FinCEN) – the U.S. Treasury Department's money laundering watchdog – announced a proposal to label crypto mixers as a "primary money laundering" concern, a move that alarmed a broad swath of the crypto industry. Treasury Under Secretary for Terrorism and Financial Intelligence Brian Nelson addressed this move and more at CoinDesk's Consensus 2024 last month in Austin, Texas on stage. The following transcript has been lightly edited (and the bulk of my questions have been slimmed down to their gist).